The Sinclair C5 has regained some prominence since Robot Wars came on television: Most of the robots which aren't powered by weelchair motors seem to be powered by C5 motors. It's really quite impressive that the motors have lasted this long, but I would still be hard-pressed not to laugh if I saw someone actually driving one on the street.

All the complete C5s I've seen have been parked inconspicuously with a big advert for some fitness club on the back.

Alas, while Sir Clive invented several truly wondrous things, the C5 is probably not one of them.